This polypropylene Coplin Staining Jar improves on the classic tapered square design with a larger opening for easier placement and removal of slides. The polypropylene screw cap is 53mm in diameter, has a flat top, easy grip larger knurled edge, deep thread and a seal ring to prevent leaks. Five internal slots hold up to 10 standard 1 x 3" or 25 x 75 mm slides back to back. The base diameter is 2⅜ ", height is 4½". Steam autoclavable at 121°C (250°F), remove cap when autoclaving.